Pitman-head



(No Model.) n

J. GARFIELD.

PITMAN HEAD.

Patented Feb. 3,1891.

UNITED STATESA PATENT GFFICE.

JOEL GARFIELD, OF IVORCESTER, MASSACHUSETTS.

PlTNlAN-HEAD.

SPECIFICATION forming part of Letters Patent No. 445,77 5, datedFebruary 3, 1891. Application led April 7, 1890. Serial No. 346,989. (Nomodel.)

.T ctZZ whom it may concern:

Be 1t known that I, JOEL GARFIELD,01E the city and county of IVorcester,and State of hlassachusetts, have invented certain new an d usefulImprovements in Pitman- Heads for illowinglilachines3 and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, forming apart of this speciiication, and in which- Figure l representsacross-section through the crank-pin, showing beyond a side View of myimproved pitman-head. Fig. 2 is a plan view of the head. Fig. 3 is avertical longitudinal section thereof, taken on line a, Fig. 2. Fig. 4.is a horizontal longitudinal section taken on line Z1, Fig. l. Figs. 5and 6 are detached views of parts of the pitman -head hereinafterdescribed; and Figs. 7 and S are vertical and horizontal sections,respectively, similar to Figs. 3 and 4., showing modifications in theconstruction, also hereinafter described.

The object of my invention is to produce a pitman-head formowingn1achines that is susceptible of adjustment to take up thelooseness produced by wear of the crank-pin bearing, that is strong,durable, and effective in use, and which may be automatically oiled in asatisfactory manner.

It consists in combining with the outer casing and crank-pinball-bearing a detachable ball-holding device consisting, preferably, ofan adjustable plug having means for holding it in position and informing an oil-chamber in said casing connecting with the ball-socket,the construction being such as to retain the oil in said socket, so asto oil the bearing for a much longer time than by the usualconstruction, as hereinafter more fully set forth.

In the drawings, A represents the outer casing; B, the pitman-rod; O,the ball fitted in a suit-able socket in said casing and connected withthe crank-pin C.

D is the adjustable plug, and E the oil-chamber in casing A, previouslyalluded to. The casing is made open at the opposite end from thepitman-rod to receive the ball and plug D and with a lat-eral or sideopening to receive the crank-pin C. A longitudinal slot a is also formedin the casing extending out from the side opening (see Figs. l and 4) topermit the crank-pin to pass forward in slipping the ball and said pininto position, as is shown in the first Afour figures of the drawings.The longitudinal opening in the casing is extended cut cylindrical inform from the inner socket end that the ball lits into, and the plug isfitted thereto as well as to the surface of the ball, as is shown inFigs. 3 and 4. Said plug .is held in position against the ball, leavingsufficient play for said ball to easily turn by the hollow holding-capF, which is turned on over the end oi' the casing, said casing and theinside of the cap being threaded for the purpose, a nut F being alsoformed on the cap t0 facilitate turning it into position. The outer endof the plug D is preferably convex in shape, so as to obtain -a centralbearing against the cap F, while its opposite end is concave in shape toIit the ball. By this arrangement of employing a longitudinal plug,fitting against the ball C and a cap F, as aforesaid, it is obvious thatas the ball-bearing becomes worn away by use the parts may be fitted uptight again by simply turning up the cap over the casing.

In iitting the parts together the ball and crank-pin C C are 4iirstslipped laterallyinto position, the ball passing into the longitudinalopening in the head, andits pin through the longitudinal slot d',previously referred to. The plug D is then slipped longitudinally intosaid head with its concave end b fitted against the ball, after whichthe cap is screwed on over the end of the head up against the plug tohold the latter in position.

Although I prefer the foregoing construe tion, I do not limit myselfthereto, as a similar result may be obtained by forming an internalthread on the casing and an outer thread on the plug D3, so that saidplug may be screwed into said casing against the ball, as is shown inFig. 7, in which case the cap F, being unnecessary, is dispensed with.In Fig. 8 a similar construction is shown, except that anexternally-threaded collar D4 is substituted for the solid plug, whichis screwed into the side instead of the end of the casing, and saidcollar provided with a longitudinal opening D to receive the crank-pinCl', which in this instance, as will be observed, comes in linetherewith. B y this construction the Wear is taken up by lateral insteadof longitudinal IOO adjustment; otherwise it is substantially like thosepreviously described.

The oil-chamber E is formed in the casing, and extends from in front ofthe threaded longitudinal pitman-rod opening around under the ball andconnects at or near its lower end with the chamber or socket in whichsaid ball is tit-ted, the casing being enlarged suiiiciently upon theunder side to admit of the formation of Lsaid oil-chamber therein, andis provided with a hole at d to allow the oil to pass out into thesocket, as aforesaid, and as shown in Figs. 3 and of the drawings. Inpractice said chamber is preferably filled with cotton waste or similarmaterial in connection with the oil, and said oil and waste are suppliedthrough a suitable pluggedinlet l)2 at the top, as ordinarily.

By constructing the pitman-hcad as hereinbefore described it is obviousthat the oil will be retained around the ball up to the level of theside opening, and therefore the ball-socket in a measure acts as anauxiliary or supplementary oil-chamber. Consequently, as but little oilis wasted, the renewal thereof is necessitated only at long intervals,while at the same time the ball-and-socket joint is kept oiled in a mostperfect manner.

Having now described my invention, what I claim therein as new, anddesire to secure by Letters Patent, is v l. In a pitman-head formowing-machines,

the threaded pitmai'i-rod and casing, the latter having a threadedopening to receive said rod and a socket to receive the ball,.alsohaving suitable openings to receive the crank-pin and the detachableball-holding device, also havingan oil-chamberextending froinin front ofthe inner end ot' the rod down. under the ball-socket; and connectedtherewith by a suitable outlet, in combination with said ball andcrank-pin and the detachable ball-holding device Whose inner end fitsagainst the surface of said ball, substantially as and for the purposeset forth.

2. In a pitman-head for mowing-machines, the threaded pitman-rod B andcasing A, the latter having a threaded opening. to receive said rod anda socket to receive ball C, also having a lateral opening to receive thecrankpin and a longitudinal opening` to receive plug D, as well ashaving an oil-chamber E extending from in front of the end of the roddown under the ball-socket and connected

